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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db885db206268d4797abc378a55bac1f7a1a051f06ee8f294ea7a60ebaed9771' 
  AND token = '8ongEbTU5/nRo3O53trgQ+60dyncCYkjCraTHbcppS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}